Friction brake



y 9, 1930. 'J. 5. THOMPSON 1,771,594

FRICTION BRAKE Filed April 30, 1927 Patented July 29, 1930 UNITED STATESPATENT orrlca JAMES S. THOMPSON, OF NEW YORK, N. Y., ASSIGNOR TOAMERICAN BRAKE MATERIALS CORPORATION, OF NEW YORK, N, Y., A CORPORATIONOF NEW YORK FRICTION BRAKE Application filed April 30,

kinds of friction brake installations. The

invention is capable of use in internal ex-' panding brakes, externalcontractingbrakes, and in other forms of brake installations for whichit is or may be adapted.

In co-pending applications, for example Serial No. 105,897 filed 'May'l,1926, I have disclosed the use of composition brake blocks or shoes, asseparate articles of manufacture,

and means for securing them in operative position upon brake heads forinternal and external brakes. These brake blocks may be made indifferent sizes, shapes and construc-- tions and they may be secured onthe brake head by different kinds of fastening devices.

In my co-pending application Serial No. 183,378 filed April 13, 1927. Ihave disclosed a head consisting of a one-piece casting hav ing recessesin which composition friction blocks are molded.

i The object of this invention is to provide a novel brake head ofstrongv and substantial construction'but light in weight, which can beeasily and quickly made of pressed steel and at relatively low cost.

A further object of the invention is to enable the brake blocks tobe'molded directly on the head or made separate and secured rigidly inplace on the head without the use of'separate fastening means.

And a further object of the invention s to make a pressed steel brakehead of light but strong construction adapted to withstand the strainsand stresses to which a brake head 15 normally subjected, and withoutbeing dis-' torted.

In the accompanying drawings I have shown the invention in'an internalexpandlng automotive friction brake, but it will be understood that theinvention may be embodied in other types of friction brakes includingcontracting brakes.

Referring to the drawings:

Fig. 1 is an elevation, partly in section, of

partsof a brake assembly showing the inven-' tion therein.

1927. Serial N0. 188,028.

. Fig. 2 is an enlarged view, partly in section, of one brake head.

Fig. 3 is a transverse sectional view on the line 3+3 of Fig. 2.

Fig. 4 is a detail perspective end view of a portion of the brake head.

Fig. 5 is a transverse sectional view on the line 55 of Fig. 6. i

Fig. 6 shows another manner of securing the pivot member to the arm ofthe head.

In the drawings 7 is the brake drum, 8, 8

which is. substantially T-shaped in cross section and is made of twolongitudinal angle members, each having a face plate 13 and a web 14.These mem ers are arranged with their webs 14 in contact and the web'sare fastened together by spot welding at suitable intervals 15 or byother means. The angle members are curved longitudinally and when thewebs are secured together the face plates 13, 13 are arranged in thesame are and together constitute the face plate of the head.

Theface plates 13, 13 may be corrugated lengthwise for greater strength,if desired.

The face plates 13, 13 are out transversely and struck up to provide endflanges 16, and the face plates are provided with upturned side flanges17, these end and side flanges forming a seat to receive the block orshoe 12. The seats on each head may be in any numher, size andshapeandthey may be spaced apart and arranged as desired. In the drawings I haveshown each head provided with two seats and two blocks and these blocksare spaced from the ends of the head and are also spaced from eachother.

These blocks are made out of a suit-able composition which will providethe desired braking friction and they are I preferably V pressed inwardlwear and heat resistant. The flanges 16 and 17 may be i'nturned as shownand the block may bemolded directly in the seat; or the flanges may beleft straight to receive separate blocks after which the flanges are tomake locking engagement with the locks] In either case the blocks willbe held securely and rigidly in place on the head.

A wear plate 18 is secured to one end of the arm and an eye member 19 issecured to the other end of the arm by spot welding or other means: Ateach end of each angle member the web 14 is bent to form a laterallyprojecting' end piece 20 and the face plate 13 is bent to form adownwardly proecting end piece 21. The end pieces 20 and 21 at each endof each angle member overlap and are secured together by spot weld-n.ing or other means. The wear plate .18 and the eye piece 19 are spotwelded or otherwise suita ly secured to the overlapped end pieces A 20,21 which provides'a strong and substantial anchorage for the wear plateand for the eye member. -The free margins. of the webs '14, 14 areturned outward to formribs22 .Which may lie substantially parallel withthe face plates 13, 13 and strengthen the arm.

Instead of providing the overlapping end pieces 20, 21 to which the eyemember is secured, I may make an eye member 23, as

shown in Figs. 5 and 6-with parallel jaws 2 h t3 receive the webs.14,14,the partsbeing rig- 'i l flat, as shown at 13 in Fig. 5, instead ofbeing corrugated as shown at 13 in Figs. 3 and 4 And instead ofmaking'the angle members separate .thefy'may be pressedup from a singlesheet 0 metal with a connecting rib 26 and with the webs spot welded orotherwise secured together as heretofore described.

' My invention provides a novel brake head of light and simpleconstruction which can be easily manufactured at relatively low cost andwhich Will -satisfactorily perform its functions. The friction blocksmay be mold ed directlyin their seats onthe head or they may be madeseparately and readily secured in rigid position on the head. It isintended that the head should be made of sheet metal cut and pressed todesired shape, since this can be done at relatively low cost, and sinc'eblocks may be used which will give long and eflicient service it may befound to be satisfactory to scrap the head when the blocks are worntothe limit of wear and substitute a new head; but it is obvious thatthe flanges 16 and 17 may be easily opened to receive new blocks andthen clamped down upon the new blocks, so that if found desirable wornblocks ma be replaced by new blockshave shown and described theinvention in a simple form, but I am aware that changes secured togetherby belts .or rivets 25 or y spot welding. The face plates may be in theform,-proportion and construction of parts will be necessary to adapt itfor different friction brake installations in the automotive as well asin other fields and I reserve block.

2. A brake head for a friction brake comprising a pressed sheet metalarm corrugated longitudinally.

3. A brake head for a friction brake comprising a pressed sheet metalarm having a face plate corrugated longitudinally.

4. A brake head for a friction brake comprising a pressed sheet metalarm having a face plate, a friction block'seated on theouter face ofsaid plate, and transverse flanges struck up and projecting outwardlyfrom the face of the brake block.

'5. A brake head for a friction brake comprising a-pressed sheet metalarm having flanges thereon spaced from its ends forming a four-sidedseat, and a friction block secured in said seat. p

6. brake head for a friction brake comprising a pressed sheet metal armhaving side flanges thereon and end flanges struck up plate to engagethe .ends of the a therefrom and forming a seat spaced from the ends ofthe arm, and a friction block secured in said seat.

7. A brake head for a friction'brake com-- prising a pressed sheet metalarm having a pair of transverse end flanges thereon forming a seat, anda friction block secured in said seat by frlctional engagement of saidflanges therewith.

' JAMES S. THOMPSON.

